<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        button:focus{
          color:#AA80FE;
          text-decoration:underline;
        }
        
        button:hover{
          color:#FF0000;
          text-decoration:underline;
        }
        button:active{
          color:#FFCC00;
        }
    </style>
</head>
<body>
    <button>按钮</button>
    <a>这是一个样式</a>

</body>
</html>